3/7=21d

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Solution for 3/7=21d equation: 



3/7=21d

We move all terms to the left:

3/7-(21d)=0

We multiply all the terms by the denominator


-21d*7+3=0

Wy multiply elements

-147d+3=0

We move all terms containing d to the left, all other terms to the right

-147d=-3

d=-3/-147

d=1/49

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